update readme

README.md

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 LifterLMS Coding Standards
 ==========================
 
-LifterLMS Coding Standards (LifterLMS-CS) is a project with rulesets for code style and quality intended for use in LifterLMS projects.
+LifterLMS Coding Standards (LifterLMS-CS) is a project with rulesets for code style and quality intended for use in LifterLMS projects.
+
+
+## Installation
+
+To include in a project require as a development dependency:
+
+`composer require lifterlms/lifterlms-cs:dev-master --dev`
+
+Note that Composer won't run configuration scripts in this scenario and the root project needs to take care of it.
+
+## Developing LifterLMS-CS
+
+To include in a project and make changes to the LifterLMS-CS project itself:
+
+Add to your `composer.json` file with the `@dev` tag and reference your local copy of this repository in the repositories block:
+
+```json
+"require-dev": {
+    "lifterlms/lifterlms-cs": "@dev"
+},
+"repositories": [
+    {
+        "type": "path",
+        "url": "/absolute/path/to/lifterlms-cs"
+    }
+]
+```